Answer: MATHEMATICAL FUNCTIONS
Explanation: Mathematical functions are actually showing how a particular value or a situation is related to another. Example can be seen in the climate or weather conditions ( how the appearance of the Sun is related to the time)
Mathematical functions deal with integers to integers or real numbers to real numbers. Functions are usually represented as fx showing that f is a function of variable x, functions are used in different fields like engineering, statistics, economics etc to solve Complex Data related problems.